I havent been around in a while but this past September I went to jail and kicked a massive prescription pill (barbs, benzos, subs etc) habit. I did this without any medication at all and all at the same time. My point being that I had been trying to get of bupe for a long time and shooting it made it fucking miserable. I was doing 1 maybe 2 mg a day and switiching back to sublingual dosing never really felt the same. I would suggest tapering off orally to as small a dose as possible then using Phenobarbital which is what I was eventually allowed to have in jail due to a seizure disorder to help with any withdrawals. It helped me significantly kick a 16mg a day for 2+year sublingual habit or at least curb the tail end of the withdrawal process.